When you are having a leg injury, it will be hard to move around by using the crutches. You have to move really slow, one step after another step, and need to be extra careful for not hurting the injured leg while walking. Now, with the knee scooters, you can move around faster and no need to worry of hurting the injured leg again. Just place the injured leg on the cushion pad and u can let it rest while another leg is doing its job. It is comfortable and much easier to use than crutches.